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I claim as new and MIS L? 55Min??? Letters Patent:

1, Aya new article of maeufactum. a tml comprising a shank, and a head of greggi' than the shank and formd iniegre] gherewith and having rentrant suruces itenglwin lao luces @Il roximately in @wie de @Jue Shen whereby' e@ cre of 'hedfl nia'y receive Isulleetantiallly Re Isume degree of hardness es that of the s mk in the process of hardenin the tool.

2. a new article of manu acture, e rivet Set comprising a Shank and @laterally bend gf grggter diameter than the s ank, the core of said head having Substantially the seme degree of hardness as the shank GERGE R. RICH. 

